<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>

<body>
    <div id="app"></div>
</body>
<script>
    let demo = {
        data () {
            return {
                list: [1, 2, 3]
            }
        },
        template: `<div>
                        <slot v-for="item in list" :item="item" />
                    </div>`
    }
    let vm = {
        data () {
            return {
            }
        },
        components: { demo },
        template: `<demo v-slot="data">
                        <div>
                            {{data.item}}
                        </div>
                    </demo>`
    }
    Vue.createApp(vm).mount('#app')
</script>

</html>